Cannibalised Faith
Cannibalised Faith is a notable Ascendancy passive skill for the Warlock of the Mists that grants added physical damage based on the life cost of spells you cast yourself, somewhat similar to 
Archmage SupportArchmage SupportLightning, Arcane, Support, Spell
Icon: ^
Level: (1-20)Requires Level 31Supports spell skills that deal damage with hits and have no reservation. Cannot support arcane skills, Brand skills, Orb skills, Vaal skills, or skills used by totems, traps or mines. Cannot modify the skills of minions.Supported Skills gain Added Lightning Damage equal to (10-19)% of Unreserved Maximum Mana
Supported Skills have added Mana Cost equal to 5% of Unreserved Maximum Mana
Additional Effects From 1-20% Quality:
Supported Skills deal (0.5-10)% increased Spell DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Skill Gem you wish to augment. Right click to remove from a socket.
.
...if Life Cost is not higher than the maximum you could spend: If the life cost of a skill exceeds the amount you could spend, the skill deals no added Physical Damage.
Due to the requisite node of Sanguimancy removing all mana, it is not possible to scale the life cost using 
IndigonIndigon
Hubris CircletEnergy Shield: (200-257)Requires Level 69, 154 Int(150-180)% increased Energy Shield
(6-10)% increased maximum Mana
Recover (8-10)% of Life when you use a Mana Flask
Non-instant Mana Recovery from Flasks is also Recovered as Life
(50-60)% increased Cost of Skills for each 200 total Mana Spent Recently
(20-25)% increased Spell Damage for each 200 total Mana you have Spent Recently, up to 2000%Where the body's limits begin,
the mind's limits end.
. However, other methods of increasing cost (such as 
Fevered MindFevered Mind
Cobalt JewelLimited to: 1
Radius: Small+(5-10) to Intelligence
Notable Passive Skills in Radius are Transformed to
instead grant: 10% increased Mana Cost of Skills and 20% increased Spell DamageCorruptedIn sickness, the insane becomes sane.Place into an allocated Jewel Socket on the Passive Skill Tree. Right click to remove from the Socket.
with a skill that originally had a mana cost) will work. 
Lifetap SupportLifetap SupportSupport, Duration
Icon: T
Level: (1-20)
Cost & Reservation Multiplier: 300%Requires Level 8Supports any non-blessing skill. Minions cannot gain the Lifetap buff.Supported Skills Cost Life instead of Mana
Gain Lifetap after Spending a total of (23-273) Life on Upfront
Costs and Effects of a Supported Skill
Supported Skills deal (10-19)% more Damage while you have Lifetap
Lifetap lasts 4 seconds
Additional Effects From 1-20% Quality:
Lifetap lasts +(0.1-2) secondsThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Skill Gem you wish to augment. Right click to remove from a socket.
provides a 300% cost multiplier to any skill, the highest cost multiplier currently available.
Version history
| Version | Changes |
|---|---|
| 3.23.0 |
|